1 // SPDX-License-Identifier: GPL-2.0+
2 #ifndef __BTRFS_DISK_IO_H__
3 #define __BTRFS_DISK_IO_H__
4 
5 #include <linux/sizes.h>
6 #include <fs_internal.h>
7 #include "ctree.h"
8 #include "disk-io.h"
9 
10 #define BTRFS_SUPER_INFO_OFFSET SZ_64K
11 #define BTRFS_SUPER_INFO_SIZE	SZ_4K
12 
13 /* From btrfs-progs */
14 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
15 struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
16 		u64 parent_transid);
17 
18 int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
19 		     u64 *len, int mirror);
20 struct extent_buffer* btrfs_find_create_tree_block(
21 		struct btrfs_fs_info *fs_info, u64 bytenr);
22 struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
23 					    u64 bytenr, u32 blocksize);
24 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
25 					       struct btrfs_key *location);
26 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
27 				      struct btrfs_key *location);
28 
29 void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
30 		      u64 objectid);
31 
32 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
33 struct btrfs_fs_info *btrfs_new_fs_info(void);
34 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb);
35 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info);
36 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info);
37 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info);
38 
39 struct btrfs_fs_info *open_ctree_fs_info(struct blk_desc *desc,
40 					 struct disk_partition *part);
41 int close_ctree_fs_info(struct btrfs_fs_info *fs_info);
42 
43 int btrfs_read_dev_super(struct blk_desc *desc, struct disk_partition *part,
44 			 struct btrfs_super_block *sb);
45 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
46 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
47 int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
48 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
49 			 int verify, u16 csum_type);
50 #endif
51